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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac9332db8e82e5535c68cf47b469202a5e9d0e3782206f878e989b37f93c8b4' 
  AND token = 'MmV7S4/wtSN5tYtWPKWIG5tPk8oug2N99zNd/qlwdNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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