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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15e9661bbc0a45b99d7c9bd7ca348b43cd74569ab61840c245a3b22045bff9cd' 
  AND token = 'UdtUfGhiFjqjsVrSUOyFu0rHAh+c8E7KOUFjyTHCSC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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