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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16af6c6bc9c7f89b1f6a7c976fc89b4e2e1e9e059aa9041c541ef9e36c10a0b9' 
  AND token = 'dpRgQOhE9xOqX9scaDGYDUt0O7C7/ktEO4X3/dXz6l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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