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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5444794e6f80fe130e1ac27d1541de871e937461323d019ae0c115a2add20cd5' 
  AND token = 'yvpN74lN1Jkoaaqkpk6wCLbWAQhYFbMInoL2AMq1bPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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