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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ade550706f45b51ef8036fe6b4afc4b24b60655270382e4fab81e6c59b9115' 
  AND token = 'B2dlKEFNEI1Mn4DhJErhWq1bDp6sU3fvyLjO0psiexU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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