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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff40dc7ce0b5a08a4bfc9f9b06d73329ffdfea3682b5d236e755f36fdd01262f' 
  AND token = 'Tp4ioc0V5sm/9Yg18nODOBFt9dsfiE3UKivBt+RuENY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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