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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479f90f3bcce944d60278d0fa6ef573410c0c9b4bc1946caa5e80b4839fe1d9c' 
  AND token = '9WlCIFFXzQD6EPbgeMVQTHUAtG7eDPQXUydHK6wDQRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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