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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67106f935f169e7c7d9ef7cdb1a03cd2d724ea01b9d9e0ff25525451438b6d3' 
  AND token = 'G5eNtPqgXdmejnJFtPIRldXU/7GpnDkIFDHLDV3LQp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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