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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '308b5b73294c54a13c60cfb84ff59407f08cb294f4b26e3c85eb05a5665ed753' 
  AND token = 'trRhMt9mSoEknIFkUFYXQG0y8y6H+bjNbWumNL+zghE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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