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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6841b3f1e80534652eefdc77423a5ece201d7a5c60a23b2eaf496dc2586b12' 
  AND token = 'DLlE+uESSckOMf75uEwy9jckshrSclVy4hke3WLnyaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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