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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568cf52cd8e5d578c85c1e71c6aff31c26d0b698ae9cdca4986a231e18777cd2' 
  AND token = 'vPD3apY4zNqOY+vjOVmiURkf/10fB07gCwi935kXC7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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