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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c943eab6844f4778e051960122af65e56854042f42372309fc93524d4b364a' 
  AND token = 'roq26u4Nifvkj7KIX0vYE2naj4S2NELA5Cx9OZahSvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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