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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c661b8d8ceda5a8752ecb168b2c2174f836bd8e849f281fdf55c277feac0959' 
  AND token = 'oSgRE8D6TrzHOCkkztSEUMd/fh+2Rc4m5dCjK/PrBcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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