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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e8aac64dee9ba3a707185be60c2a5ab646857d5e1d49342db46761ce6af64ad' 
  AND token = 'iFaHFeucgVGAknrGxvUD3c6pPX6cGY3OqdiuQgxrP9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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