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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b4ecd458bf9a75a15f1194c8b14b58abd56aea62eed2625cc21d7da7cd084c' 
  AND token = 'aov+Oe1urPuxiCNxe03OQoM4pakXY/5K/3wderArwjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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