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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e902d882d304e7e439dc4f9be7b4e8dedf81b9da85283f2c2485fd19ac7922' 
  AND token = 'sbGQs0wdtrIlIg0l3Y+tdH9JHPSXJkbngbKLAdRF5ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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