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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd937799e1399da8e334cfaf5c129a2c3a79b7643f8a50a2d417b18095d99108b' 
  AND token = '9j6zqT9rpgWEA9fvQiVYFFsAXI/Dr7q/0T/oGmSEKB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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