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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29865afb83d246965e8984d23036381e40bf87b64cb4704aa9d961a174252908' 
  AND token = 'I2foA4ZqU7v6e6tPmn688BQ29oMRrfcV70ANqBdnJzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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