SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d6e40fbd04e2bc4664e9112fe8830a3222c643110bb649189ff09e057c5937a' 
  AND token = 'NLsPLorZGdDapavp/LouZ5EBv8JV4jNgqCRQAhu/SQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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