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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63e57f84fb8512bb5f32e9c081218ca10e71bb83585bdeb0eeb213afef7e7b7' 
  AND token = 'RvaxDc/2m5LomABdCsvbTxuJMnawF6+teet3dPaFqAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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