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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efdba0a95a800ac2f486467eff80796e02d85c668f7a29a9e450fdbd4e0a99c' 
  AND token = 'K4Rh1pYXvitX4sTmRKsRgyDypZfclQA3cbpYuLJkJKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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