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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806ece4ddffb6a6cbe3ff9f79be11f3c3dad724d06736a4e839369e412c668ab' 
  AND token = '93vJ3VQzIlNeB/8bxztQc3Kkd9UIEJ4wO6eO3EZtgHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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