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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e6af5342e284ef97bceaf6c22b6a64b7ff1685f89cef546cb1f93e6d893bb5' 
  AND token = 'hEsnkt0sRTRm7nB9BwVepnYvvaNRjISLN0jqfrG6KjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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