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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5924edee06769e7d1aaa6a77c2e6ed1064c4e7a3114be3abedd7befcdea94946' 
  AND token = 'Z5U148kp6y/DBq8MhVJs2e95cA2YL2v6TfKElUzwqHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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