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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25bbfcb422696c246ad9e20f4cf3dfbd12a504d795b4a6d1025661a25ea36b1e' 
  AND token = 'IHg9uKgCCsZzce4JDDia2EI5CUF/CyxCwmCAotr5Tlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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