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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d4a7d33565be9c612541fca1ed3fec6225dca8333e341c97a27e04e6d5799e' 
  AND token = '2LrgJPBL0JgQmYQJUok5ypnEt3wHb+as5VX+tbdo3GE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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