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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '955ce95bfe7258de58ad5c56d4dd912ce6714debfa945ce501677698b799d3e6' 
  AND token = 'Mghg0ZbP793HzSe9+c1mfd51heTKbnvXFk0ACRgQCvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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