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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50356a6e001b22e29ac206a36db26454b79e7483b6d5f50b0151c65bd4c3ce05' 
  AND token = 'aotaie/pqkd20tcXbQLu45GXEGlRf/VnjlzmXToyE5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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