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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aef139c7e0f3b81dcee7a6dcd142c802f28267cfcb657544c18d59541d3d4bef' 
  AND token = '6S0ZQaTcRkV3hhVCkSNbeQk6Wus7kkc9hx3TfUciaEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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