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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8504dd98c15291cf8f5208c8447805c0a21bd0ea772f7f99e445963acd1f5480' 
  AND token = '6Y0bolOEbm86mRuS/w34LSHIljHj7gqwWta0lxRNSJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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