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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c936e120bffdf25dfde67413175cfaf7cbf22d7329c1a81085d05c30328c14e' 
  AND token = 'Dou9o69aFT7b5zq6axqYwwd3JPwMoioPfg8WS9gxhKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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