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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf83b2b0405f5f51cedcb486b8e768ff9938826ab48d3060e05074a9cb002d1' 
  AND token = 'r1G7K4WCjFfEATbKDIVAM1pdzKny8l+EDxK/gcpcQIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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