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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4bebdf01ab89be7b92ee6842b4468d3f878e4c193b83573be680af8456358d2' 
  AND token = 'h757sGNhLpP+Ofw7Gn96SbitR/zy4nsN7CJP7wExkd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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