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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6301d71b3a9c1d4f34e9099ebe2eaa482c59a6a81ce74047b827dfe35888996' 
  AND token = 'Q3e5hhcd4hWEFrQGChHz/QSvvmygStI8d92+PdNZNBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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