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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9a8f8032ae9a577f808e8d1b819c8a8b67eb1d68c487406ecf0c72c9af9ec6' 
  AND token = 'rt7tqJUSLnQhb4Ekfl/upTzxwZUIzubEzpcl+pgdhe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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