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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737b118937c8e38cce567f8e41a4e86ef7c2b90ab8bb1ac1a18b08677b1fee29' 
  AND token = '0xnVfZQK+kyQduosOms1J+V5G7KGj6La7U8pcT2Geyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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