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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8392d6ec2f09ced7720bbf4064268667675a9ab365c93815ba4b0c47bedfea' 
  AND token = '4AbpRj/Y0RmegUeWKmt1MuMgZ5aGb6lMRi4U8xqkYh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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