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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0630cac7c35011afaedce09ace1789b380396493eb117ef20494d60c5f4a6e22' 
  AND token = '3v2eQzyNaBv9qRxrLkWawCPvP5nM9g1VnBjvFSqWxE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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