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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99eb10951d39fdacffa29aab8d55c77fca8f157669de53a6848d56a80b12d44e' 
  AND token = 'v9a7euB8INpSHeG42df6ZFi2v9aZUs08MKZAoNPKLPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}