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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8e0a84b2e0e85933904b62b52e38e1a3bddfcd466c691c332a68b1ffbf22cc' 
  AND token = '+mbed6+47MWS7MRjguy20DQu8SI6uMKVstxxmBepJdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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