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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1095fb2a41f73b0a6be41f0e180c230895eadce55527c20d5e70fabeee654510' 
  AND token = 'nSkCbFbJU3cVoi6vWMgUtPpUjf9MMz1bJuNvvp+x4yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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