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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd48ee73c36a2527c6417713932965005674195a877ce3f8a242b7d9a3ec055c' 
  AND token = 'ZbVE1fyVbRSHyNOK0i4/G8S2LnaTvN6Fowd8XKUrUyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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