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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d5b9c0c5ae4a3d14ba1df0f9bfd0aed3aa22bd65e2e3e9ce8f2f47aaf2d540f' 
  AND token = 'mcERLmYlm25M4VCp3mTl4mJ9ELZm26vcRLMqLSOngeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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