SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41572117718d037c3e5a12c9fd6be83f5f49e6e26a2a410fa12725d9256c799c' 
  AND token = 'QfceQ03vLrNG9o/gzOPurW8kUG7VIZt1PAtHKBhpCRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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