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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b64816f045c4d0f321c204b50b2a49e0f0e52d2a0076b2144a97d6bff59e75' 
  AND token = 'Mu0DFyd8IAe8aJ3bp/90hdtd8tAy4DmkrXeL8eSwYxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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