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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2603824fb3c06771925e2df20efce69089b21bb609de7788570a18708d86d38d' 
  AND token = 'PCsrCqmdla24NwFOq1yAAayQPf+TNTLS+Pmoossaryg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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