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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0bcb98f00db42f4354b604165dcf19a34d106de9de134351b4a8d37d86db79' 
  AND token = 'ZvhOnDKURc/xCD7SunUPHEt4//E4obZ6TA6Rsx7jRkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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