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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ff92fd2b0fb224164e52fa17ef8d98257afe61fd043821ff8e554ff7506b42' 
  AND token = 'uG1n5tJo9Qn8ESbR6b+35Zg+mSnh1jmxkKAB+R194X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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