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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60b9fbd90ab6a28a8ed1581e0c67f14a6aaf422323a5154f9c5f22d9cfc2512' 
  AND token = 'AJ1rG962fDyrF4+902w++8oLIQENZWct8jjQd3rrmvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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