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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5676cd3e7ff4b2cd63e2260081c33dd1ad2ee94489468854cc221a76766c7c99' 
  AND token = 'AAOjJ0ZZtz78Mtq4kIEGPUByNxTeYfklwthnL7wuPZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.08211

JSON explain

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