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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c962e1dcae57c432b6a705199026ec759837e7f40599de09ce2bed388c8eda' 
  AND token = 'sWy1mXnD3JFl2VhRGIbR/29Lfccaz4Uxvs3l4Taf3io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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