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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '966117d2e6bcfddd346affba22e0b5f0c1124029d28e555d900aebb2309e3585' 
  AND token = 'us3RQOt/0nXzxJS3MfxcSaqMTbXmInJfmbN2M0x3+vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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