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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d739d0ce37975a7aeeb70e31dba921e177845dd1ccdb2d77c30e4196f7d3b00' 
  AND token = '/fTOtfb8ordwpmVaNnzqeaxHcB5gFpcEgqKwe+7bxeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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