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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95fbaa73b49923579cac71cc8f123a94b1474e567527857a3132b724f9a11b8' 
  AND token = '2xpAAhglrx+8TP7UwDxtc2xfgz+EmnZyZTn1L64xn/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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