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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613b7c28752a43f508eb24827b61740a2d6366c83b1ad9d52210838de403695e' 
  AND token = 'oZ12NePEwQGW1t7lgdxeCx5HoELD1cRXAuNZ3IKb/Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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