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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f4607ff78bf089e899e974907969320ebf47cbee61abd0074bdf57b80875e73' 
  AND token = '1G2BjBDcJlUwk9NJGpGtNki1pO8huGvMpHahzxv1VKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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