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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '236b46efcae0bff6d943f264a0c66d999c2f36ad624ed76a26421dcdd3929113' 
  AND token = 'INbadt9yIGjlEU5G3t4mFVEC3ep4WcAianTm2ch4JvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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