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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8b08dbe816ab53b6bf3cb6ad55620b1f5bf8927abf8280886190dd11ef6b50' 
  AND token = 'qwCnhyYqlylWPI4uO0GZGyMOop/gn7/PghOVp8/p9sA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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