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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcc78d915b0130619341679deeda8cf83253bb98e4f55eec87fba022f1e71c8' 
  AND token = 'wBRGIpro+pkkHUvwb8P1bYWPAB6p4F3epHTPyQ6XIfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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