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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af287d54d0eee0ce80c88180e1062cc07ed346cbd303b8ba2ab1a26dabe97b86' 
  AND token = 'RuW5kwIXF62M9OuLJfoPfBvWmMlWU816YHrk/fzcb80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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