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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00d308db74da8576ff3553f2eb404eacce320b3d312ed806a5226fe2bdbc278' 
  AND token = 'GgKHSo1I5jszK5Ctpx2fQ58vjF6hiVgAlL9D3E+hgKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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