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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf0cdbaf11045ee2fc71e0ac5e60187333622dd7a6739a879b825c185221ff96' 
  AND token = 'jKmws+ppN1GPR30RpXcyNA87P4AFbdP/q5TaUsoxRrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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