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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3763c6a5d647e4d1eaa36fecf223de634a1785ba92d816c1f303a4a00a46ec73' 
  AND token = '08tXBCD3pdJJMmZl5rF2xdRjrERklef6ELqPjD788IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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