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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771a23b1614786e1cf7e9547a4fe68d27289234f8c4c20efd2f6260dd4fc667f' 
  AND token = 'OLJ8ExzdU71DjKKCLbi1KZDNDPNsG1JCfZHjTVkBc4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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