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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6115c47b5c134d23280a11c69725c88f4ecba55a986bc6f271a3e05d64288696' 
  AND token = 'QbYRqDtgpoqAmDdC0CrirBeeVUK3UNju9k9bIamJY90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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