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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1368d41be8dca282c6bbebe6713401e5734120f50009c023e87457539e2e881' 
  AND token = 'ePtNiB3B0lxT1NWBEWCv0rwV8yUp8HwWtR/tJaIlK1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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