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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b714f04415ed70677d2a254c3ce54f256d840620796f72ea1ddc9147b84493' 
  AND token = 'NC2n319HMN71A+DUGQfr8/K2jQXwzYsxuke+AKcLoKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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