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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629506047bb39c56d02dd4e1e138b14fddeb2043ed8af8a0b48dd8cb8b9482f0' 
  AND token = 'vT0gI3wD1oLJFIaukcng49pXFcBvZ1iiHoFENrsB81A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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