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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3c28e6ec37a07b5cb6ecdf5ec62ff1e3b6ad96da8759a73d6a34561f0e9e19' 
  AND token = '1Gsxxf/goYG1QQoIHDULsRfjjCqf3qqPro0JOy5vwTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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