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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6535f368e899b8949ab503fb6a7dcca0e6fd07ebc6c697404d94684f7b6169' 
  AND token = '4SpPsgSmFvh49SlkQwZyo3+Y30wgInJLDnuA0C9lD20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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