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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80bc5755e66d7481d464df6fad50bd589e95bf3a2a82efe31e6f773a7ec27edc' 
  AND token = 'rg2Ul6/nRQAHERRwrsX6A9djZL7A2Zz811fsoEH3e/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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