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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddc14c9c60e683ba0e29e3ebf47ddc2473bd14cdad14ced7aadb51e43b1344e' 
  AND token = 'NYTcvovZHG/k+Fjh8rlMUPQQeIhKUW2ld0BZhtcRcic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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