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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5853a1ebb2cb5a5cce2490be06fe7e08ac98e02707eb0586fb1ca6da34ea9edd' 
  AND token = 'TFtJwDQtuTGDztJCmy8ZBG9YnRffg4CmeLhAgVbKu3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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