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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b07053bd5509a2ad810a54496ba11b5a9a0ac8792fe674b098dca3af3bc5e4' 
  AND token = 'aiV7vrOjzyemSMMZOj2WTA0RiaXPQTMeJBXC/Zw6ht0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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