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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6c17311786e87c96a20eb18feb97b0dcf9288ec28f3954b8e50a2745114539' 
  AND token = '0o3WNUzMPGKJLNg6y4WJS/iD7vssO1yw1noq8yQW7T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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